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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50770e7fb5ab36e7b041e3c2489daee911c8910d9671dd54b6f6054967d18716' 
  AND token = '7bTyA9QhVITJ39uLdygjl5nUCabwdiB3MNbrchf5KnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}